Software Suspend 2.0

From: Nigel Cunningham (ncunningham_at_clear.net.nz)
Date: 01/30/04

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    Date:	Fri, 30 Jan 2004 17:24:25 +1300
To: swsusp-devel <swsusp-devel@lists.sourceforge.net>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>

    Software Suspend 2.0 for Linux 2.4 and 2.6 kernels is now available from
    http://swsusp.sf.net. The 2.0 release is a major advance over previous
    versions and includes the following features:

    - Support for HighMem[1], SMP[2] and preemptive kernels.
    - Support for any number of swap partitions and/or files.
    - Full asynchronous I/O and readahead for synchronous I/O for maximum
    throughput.
    - Image compression (LZF and GZIP - the former is very fast and highly
    recommended).
    - Support for saving a full image of your memory, resulting in a fast,
    responsive system after resuming.
    - Support for plugins: data transformers (compression, encryption) and
    new storage backends (NFS support is planned).
    - Nice user interface (Bootsplash (http://www.bootsplash.org)
    compatible;
    - The ability to specify a maximum image size;
    - The ability to cancel a suspend by pressing Escape (for security, this
    can be disabled).
    - Speed and reliability. Software Suspend 2.0 has been extensively
    tested in a variety of configurations over many months. It is not
    guaranteed to be perfect, but bugs found will be hunted and fixed
    quickly.
    The Software Suspend website includes extensive documentation, including
    known issues (primarily DRI and USB support) and FAQS. A well-used
    mailing list is also available.

    Known issues with Suspend 2.0 are as follows:
    - DRI support is lacking power management support under 2.4 & 2.6.
    - AGP support under 2.6 is partially implemented.
    - USB support under 2.4 and 2.6 is lacking.
    - SMP support is currently 2.4 only.
    - Other drivers have varying degrees of power management support.
    - There is currently no support for discontig memory.
    - Suspend currently requires the PSE extension (check /proc/cpuinfo).
    - Highmem >4GB is currently not supported.
    - SMP currently suffers from lost interrupts during resuming
    - 2.6 does not currently flush caches properly before powering down.

    Some of these issues have work-arounds available: check the FAQs for
    details.

    Note that two patches are required to use suspend: one for the
    particular kernel version you are using (make sure you get the most
    recent for your kernel version), and a second (applied afterwards)
    contains the core files.

    Special thanks go to Gabor Kuti, Pavel Machek and Florent Chabaud for
    their work, which I have built on; to Michael Frank for many months of
    extensive testing of the code, to Marc Lehmann for supplying the LZF
    compressor, to Bernard Blackham for maintaining the swsusp.sf.net
    website and especially to LinuxFund.org for their sponsorship of the
    project, which has allowed me to work full-time on Software Suspend over
    the last four months.

    Finally, heres a little ditty, to be sung to the tune of the 'The
    Pirates Who Don't Do Anything'
    (http://www.bassbios.com/bodclan/pirates.mp3)

    I'm just a user who wanted to suspend,
    I didn't want to be a kernel hacker at all!
    I'm just a user who wanted to suspend,
    and now I'm happy because I can suspend.

    Well I've never been to LinuxConf
    and I've never written a device driver
    And I've never talked to Linus
    and I'm not an expert at BK
    And I don't normally get paid to do this
    and I don't own any hardware manuals
    And I've never been to Boston in the fall...

    [1] Up to 4GB.
    [2] SMP is currently only supported under 2.4; 2.6 support should not be
    far away. 

    -- 
My work on Software Suspend is graciously brought to you by
LinuxFund.org.
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